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From: gardos@kodak.UUCP (tom gardos)
Newsgroups: net.unix,net.unix-wizards,net.micro.pc
Subject: XENIX assmblr OUT - Device Driver
Message-ID: <298@kodak.UUCP>
Date: Wed, 9-Apr-86 16:04:18 EST
Article-I.D.: kodak.298
Posted: Wed Apr  9 16:04:18 1986
Date-Received: Thu, 10-Apr-86 21:32:59 EST
Reply-To: gardos@kodak.UUCP (tom gardos)
Organization: Eastman Kodak Co., Rochester, NY
Lines: 21
Keywords: out, in, I/O, XENIX device driver, assembler
Xref: watmath net.unix:7590 net.unix-wizards:17530 net.micro.pc:7730


SYSTEM: IBM XENIX  V1.0 running on the IBM AT, iAPX 286 microprocessor

As some of you might have read earlier, I am trying to write an I/O routine
in assembler using the IN and OUT assembler instructions. I have written this
as a device driver and loaded it into the kernel. However, upon execution,
I crash the system with a TRAP type (13) or hex D - which essentially
states that the process doesn't have high enough priority level (I think).
Shouldn't the priority be high enough since it is a device driver?
Perhaps I am assembling my assembler source file wrong. I know for C
source files, one must strip the stack probes and other such things.

Could someone who has actually written a device driver in assembler or
one in C that called an assembler function please let me know how they
wrote it and compiled it? This is beginning to get frustrating!

P.S. This isn't relevant but is there a way to read articles that
have already been read?

-- 
Tom Gardos